14 CFR § 25.1192
Engine accessory section diaphragm
July 13, 2020
For reciprocating engines, the engine power section and all portions of the exhaust system must be isolated from the engine accessory compartment by a diaphragm that complies with the firewall requirements of §25.1191.
[Amdt. 25-23, 35 FR 5678, Apr. 8, 1970]